Chemical Formula:
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Mn++3[Mn++3Fe+++][(Si,Fe+++)4O10](OH,O)8 |
Composition:
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Molecular Weight = 703.49 g |
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Hydrogen |
0.57 % |
H |
5.12 % |
H2O |
0.00 % |
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Oxygen |
40.94 % |
O |
0.00 % |
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0.00 % |
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Magnesium |
10.36 % |
Mg |
17.19 % |
MgO |
0.00 % |
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Silicon |
15.17 % |
Si |
32.46 % |
SiO2 |
0.00 % |
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Manganese |
23.43 % |
Mn |
30.25 % |
MnO |
0.00 % |
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Iron |
9.53 % |
Fe |
13.62 % |
Fe2O3 |
0.00 % |
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100.00 % |
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98.64 % |
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Empirical Formula:
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Mg3Mn2+3Fe3+Si3.8Fe3+0.2O14(OH)4 |
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Environment:
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Veinlets in Mn-rich skarns |
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Locality:
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Langban, Varmland, Sweden.. Link to
MinDat.org
Location Data.
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Name Origin:
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Named for Forest A. Gonyer (1899-1971), chemist-analyst and mineralogist, Harvard University |
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Synonym:
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